Liu Wuyue, Sun Shaoming, Zhou Liang, Cui Yong, Zhang Wenkai, Hou Jianhui, Liu Feng, Xu Shengjie, Zhu Xiaozhang
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Angew Chem Int Ed Engl. 2022 May 2;61(19):e202116111. doi: 10.1002/anie.202116111. Epub 2022 Jan 14.
Semitransparent organic solar cells (ST-OSCs) are considered as one of the most valuable applications of OSCs and a strong contender in the market. However, the optical band gap of current high-performance ST-OSCs is still not low enough to achieve the optimal balance between power conversion efficiency (PCE) and average visible transmittance (AVT). An N-substituted asymmetric nonfullerene acceptor SN with over 40 nm bathochromically shifted absorption compared to Y6 was designed and synthesized, based on which the device with PM6 as donor obtained a PCE of 14.3 %, accompanied with a nonradiative voltage loss as low as 0.15 eV. Meanwhile, ternary devices with the addition of SN into PM6 : Y6 can achieve a PCE of 17.5 % with an unchanged open-circuit voltage and improved short-circuit current. Benefiting from extended NIR absorption and lowered voltage loss, ST-OSCs based on PM6 : SN : Y6 were fabricated and the optimized device demonstrated a PCE of 14.0 % at an AVT of 20.2 %, which is the highest PCE at an AVT over 20 %.
半透明有机太阳能电池（ST-OSCs）被认为是有机太阳能电池最具价值的应用之一，也是市场上强有力的竞争者。然而，当前高性能ST-OSCs的光学带隙仍不够低，无法在功率转换效率（PCE）和平均可见光透射率（AVT）之间实现最佳平衡。设计并合成了一种N-取代不对称非富勒烯受体SN，其吸收峰相较于Y6发生了超过40 nm的红移。基于此，以PM6作为给体的器件获得了14.3%的PCE，同时非辐射电压损失低至0.15 eV。此外，在PM6 : Y6中添加SN的三元器件，在开路电压不变且短路电流提高的情况下，可实现17.5%的PCE。受益于扩展的近红外吸收和降低的电压损失，制备了基于PM6 : SN : Y6的ST-OSCs，优化后的器件在AVT为20.2%时表现出14.0%的PCE，这是AVT超过20%时的最高PCE。
